MAS9191EB MAS, MAS9191EB Datasheet - Page 6

• Manufacturer Part Number: MAS9191EB
• Description: EVALUATION BOARD
• Manufacturer: MAS

CONNECTOR DESCRIPTION
Connector name
EXTEARP
OSCOUT
BUZZER
EARP
DACs
CTRL
T10
T11
TX
RX
T6
T7
T8
T9
J3
BNC-type connector for IF output.
Output of the peak level detector circuit for MICOUT. See Op Amp schematic.
Output of the peak level detector circuit for EXPIN. See Op Amp schematic.
BNC-type connector for received IF signal.
DEOUT is the de-emphasis filter output. The output can be used to measure blocks GC1,
F1, F3 and F4. Special test modes can be used to connect the outputs of the filter F2 and
comparators C1 and C2 to this output.
RBPFIN input.
EXPIN is the test point where expander input can be measured.
EXPOUT test point can be used to measure the expander output.
BNC-type connector for external ear piece.
Buzzer interface. Connect the external buzzer between these points.
This connector contains the MAS9191A DAC outputs. MAS9191A has three 8-bit DACs.
MS8323 VCTCXO output frequency
Use jumper to connect DAC1 output to MS8323 Vcont input.
GROUND
TXCTRL
TXON
DAC1
DAC2
DAC3
BUSY
Pin
1
2
1
2
1
2
1
2
1
2
Function
TX output signal, which can contain data, audio, SAT and Signalling tone.
Ground.
RX signal input from the external IF source.
Ground.
The output signal for the external ear piece.
Ground.
Connector for the ear piece. Note that there are already capacitors C41 and
C42 connected to the ground on each output signal.
Differential output for the ear piece.
Differential output for the ear piece.
Power supply voltage from connector T1.
Q1 collector.
Output of DAC 1. This output is also connected to Vcont input of the VCTCXO.
Output of DAC 2.
Output of DAC 3.
System ground.
Transmission is active when output is high.
RECC is busy if pin is low.
Open-drain type output. The output goes low when a transmit collision occurs.
In any other case the output is in a high impedance state.
DA9191EB.006
June 30,1997
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